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x in (-oo:+oo)
y = 1/5-(2*x) // - 1/5-(2*x)
2*x+y-(1/5) = 0
2*x+y-1/5 = 0
2*x+y-1/5 = 0 // - y-1/5
2*x = -(y-1/5) // : 2
x = (-(y-1/5))/2
x = (1/5-y)/2
x = (1/5-y)/2
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